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acuity

[uh-kyoo-i-tee] /əˈkyu ɪ ti/
noun
1.
sharpness; acuteness; keenness:
acuity of vision; acuity of mind.
Origin
late Middle English
1375-1425
1375-1425; late Middle English acuite < Old French < Medieval Latin, Late Latin acuitās, equivalent to Latin acu(ere) to sharpen or acū(tus) sharpened (see acute) + -itās -ity
Related forms
hyperacuity, noun
nonacuity, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hyper acuity

acuity

/əˈkjuːɪtɪ/
noun
1.
keenness or acuteness, esp in vision or thought
2.
the capacity of the eye to see fine detail, measured by determining the finest detail that can just be detected
Word Origin
C15: from Old French, from Latin acūtusacute
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hyper acuity

acuity

n.

early 15c., from Middle French acuité (16c.) or directly from Medieval Latin acuitatem (nominative acuitas) "sharpness," from Latin acuere "to sharpen," related to acus "needle," acuere "to sharpen," from PIE root *ak- "rise to a point, be sharp" (see acrid).

Online Etymology Dictionary, © 2010 Douglas Harper
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hyper acuity in Medicine

acuity a·cu·i·ty (ə-kyōō'ĭ-tē)
n.
Sharpness, clearness, and distinctness of perception or vision.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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